Mitre gears are used for (a) great speed reduction (c) minimum axial thrust 16. The contact ratio for gears is (a) zero (c) greater than one 17. Involute profile is preferred to cycloidal because (a) the profile is easy to cut (b) only one curve is required to cut (d) clearance circle (b) circular pitch (d) pitch circle diameter (b) circular pitch (d) none of these (b) equal speed (d) minimum backlash